n = int(input())
a = list(map(int, input().split()))

# Compress the array to remove consecutive duplicates
compressed = []
prev = None
for num in a:
    if prev is None or num != prev:
        compressed.append(num)
        prev = num

m = len(compressed)
if m < 3:
    print(0)
else:
    up = 1
    down = 1
    for i in range(1, m):
        if compressed[i] > compressed[i-1]:
            up = down + 1
        elif compressed[i] < compressed[i-1]:
            down = up + 1
    max_len = max(up, down)
    print(max_len if max_len >= 3 else 0)